Push Rod Length

Gearbanger 101 said:

Even with no shims? How many miles are on your lifters (any chance of collapse)? You are certain that you're on the base circle of the camshaft when installing them, right?

It's very rare that stock pushrods are too short for GT40 heads. What's your head gasket thickness?

Depending on how loose they are, this might instead be a good excuse for you to mill the heads. It would probably cost you about the same as a new set of pushrods, but you'll have the satisfaction of knowing the deck surface is true and you'll add a little bit of compression in the process?

You could easily take .020 off of the head surface without running into issues.

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